I get a fairly decent kick drum on the Microbrute that is hopefully transferable to the Minibrute. All oscillators turned down, cutoff = 0, resonance = 100, brute factor = 100, Env Amt ~ +7, KBD tracking = 10%, A+S = 0, D+R = 50%, filter = LP. Move the release up and hit the keys very briefly to shift to an 808 style kick. Very slightly different flavour depending on what octave you use. Env Amt and KBD tracking are the ones that need tuning most here. I didn't use the patch panel either.